{"id":46114,"date":"2025-05-30T08:26:09","date_gmt":"2025-05-30T08:26:09","guid":{"rendered":""},"modified":"2025-06-13T23:10:05","modified_gmt":"2025-06-14T05:10:05","slug":"cve-2025-39500-deserialization-of-untrusted-data-vulnerability-in-goodlayers-hostel","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-39500-deserialization-of-untrusted-data-vulnerability-in-goodlayers-hostel\/","title":{"rendered":"<strong>CVE-2025-39500: Deserialization of Untrusted Data Vulnerability in GoodLayers Hostel<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>Cybersecurity threats are an ever-present concern in today&#8217;s digital landscape, and it is crucial to stay ahead of potential vulnerabilities that may compromise system security. In this context, one significant vulnerability, CVE-2025-39500, has been identified in GoodLayers Hostel, potentially impacting any system where this software is implemented. This vulnerability, due to Deserialization of Untrusted Data, can lead to Object Injection, thus posing a serious <a href=\"https:\/\/www.ameeba.com\/blog\/ai-data-security-guidance-a-crucial-move-by-agencies-in-cybersecurity\/\"  data-wpil-monitor-id=\"52338\">security threat to both the system and the data<\/a> it contains.<br \/>\nThe <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-47577-severe-unrestricted-file-upload-vulnerability-in-ti-woocommerce-wishlist\/\"  data-wpil-monitor-id=\"52093\">severity of this vulnerability<\/a>, coupled with the extensive use of GoodLayers Hostel in various digital environments, underscores the importance of understanding this vulnerability, its potential impact, and the steps necessary to mitigate it. In the following sections, we will delve into a <a href=\"https:\/\/www.ameeba.com\/blog\/the-st-joseph-hospital-cybersecurity-incident-a-comprehensive-analysis-and-lessons-learned\/\"  data-wpil-monitor-id=\"54656\">comprehensive analysis<\/a> of this vulnerability.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-39500<br \/>\nSeverity: Critical (9.8 CVSS Score)<br \/>\nAttack Vector: Network<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: None<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-39401-unrestricted-file-upload-leading-to-potential-system-compromise-in-mojoomla-wpams\/\"  data-wpil-monitor-id=\"52078\">Potential system compromise<\/a> or data leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-1224709078\" class=\"ameeb-content-2 ameeb-entity-placement\"><div style=\"border-left: 4px solid #555; padding-left: 20px; margin: 48px 0; font-family: Roboto, sans-serif; color: #ffffff; line-height: 1.6; max-width: 720px;\">\r\n  <h2 style=\"margin-top: 0; font-size: 22px; font-weight: 600; display: flex; align-items: center; letter-spacing: -0.02em;\">\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"display: inline-flex; align-items: center; margin-right: 10px;\">\r\n      <img decoding=\"async\" src=\"https:\/\/www.ameeba.com\/blog\/wp-content\/uploads\/2025\/10\/Best-App-icon-Ameeba.png\" alt=\"Ameeba Chat Icon\" style=\"width: 42px; height: 42px;\" \/>\r\n    <\/a>\r\n    Share secrets securely\r\n  <\/h2>\r\n\r\n  <p style=\"margin-bottom: 14px; color: #d1d5db;\">\r\n    Ameeba is private infrastructure for communication and sensitive work built on encrypted identity instead of exposed corporate identity systems.\r\n  <\/p>\r\n\r\n  <p style=\"margin-bottom: 18px; color: #a1a1aa;\">\r\n    Passwords, credentials, confidential files, screenshots, internal discussions, sensitive AI context, and private coordination should not become exposed across ordinary communication platforms.\r\n  <\/p>\r\n\r\n  <ul style=\"list-style: none; padding-left: 0; margin-bottom: 24px; color: #e4e4e7;\">\r\n    <li style=\"margin-bottom: 8px;\">\u2022 Encrypted identity<\/li>\r\n    <li style=\"margin-bottom: 8px;\">\u2022 Private Spaces for organizations and teams<\/li>\r\n    <li style=\"margin-bottom: 8px;\">\u2022 End-to-end encrypted chat, calls, files, and notes<\/li>\r\n    <li style=\"margin-bottom: 8px;\">\u2022 Sensitive AI work and protected collaboration<\/li>\r\n    <li>\u2022 Built for information that cannot leak<\/li>\r\n  <\/ul>\r\n\r\n  <p style=\"font-style: italic; font-weight: 600; margin-bottom: 24px; color: #ffffff;\">\r\n    Our mission is to secure human work alongside AI.\r\n  <\/p>\r\n\r\n  <div style=\"display: flex; flex-wrap: wrap; gap: 12px;\">\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\/download\" style=\"background-color: #ffffff; color: #000000; padding: 10px 20px; text-decoration: none; border-radius: 8px; font-weight: 500;\">\r\n      Download Ameeba\r\n    <\/a>\r\n\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"border: 1px solid #ffffff; color: #ffffff; padding: 10px 20px; text-decoration: none; border-radius: 8px; font-weight: 500;\">\r\n      Learn More\r\n    <\/a>\r\n  <\/div>\r\n<\/div><\/div>\n<p>Product | Affected Versions<\/p>\n<p>GoodLayers Hostel | 3.1.2 and <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-48477-critical-vulnerability-in-freescout-prior-to-version-1-8-180\/\"  data-wpil-monitor-id=\"57848\">prior versions<\/a><\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The CVE-2025-39500 <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2022-3604-data-validation-vulnerability-in-contact-form-entries-wordpress-plugin\/\"  data-wpil-monitor-id=\"52150\">vulnerability arises from improper deserialization of untrusted data<\/a> within GoodLayers Hostel. <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-39349-critical-deserialization-of-untrusted-data-vulnerability-in-ciyashop\/\"  data-wpil-monitor-id=\"52558\">Deserialization is the process of converting data<\/a> from a flat format into an object. However, when this process is not properly secured, it can allow an attacker to modify the serialized data to inject their own objects into the application, gaining unauthorized access or potentially <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-41075-high-risk-type-confusion-vulnerability-allowing-arbitrary-code-execution-with-kernel-privileges\/\"  data-wpil-monitor-id=\"51571\">executing arbitrary code<\/a>.<br \/>\nIn the case of GoodLayers Hostel, the software fails to adequately validate or sanitize the serialized data it receives, thus <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-32401-buffer-overflow-vulnerability-in-macos-leads-to-potential-arbitrary-code-execution\/\"  data-wpil-monitor-id=\"51639\">leading to a potential<\/a> object injection. This can allow an attacker to compromise the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-31049-untrusted-data-deserialization-vulnerability-in-themeton-dash-exposes-systems-to-object-injection\/\"  data-wpil-monitor-id=\"53815\">system or cause data<\/a> leakage.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-691302423\" class=\"ameeb-content ameeb-entity-placement\"><div class=\"poptin-embedded\" data-id=\"f6b387694f681\"><\/div>\r\n\r\n\r\n\r\n\r\n\r\n<\/div>\n<p>Here is a conceptual example of how this vulnerability might be exploited. The malicious payload in the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-4829-critical-buffer-overflow-vulnerability-in-totolink-http-post-request-handler\/\"  data-wpil-monitor-id=\"52339\">HTTP request<\/a> manipulates the deserialization process, leading to object injection.<\/p>\n<pre><code class=\"\" data-line=\"\">POST \/vulnerable\/endpoint HTTP\/1.1\nHost: target.example.com\nContent-Type: application\/json\n{ &quot;serialized_object&quot;: &quot;malicious_payload&quot; }<\/code><\/pre>\n<p>This payload then gets deserialized into an object by the GoodLayers software, resulting in the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-42826-arbitrary-code-execution-vulnerability-in-macos-sonoma-14\/\"  data-wpil-monitor-id=\"51603\">execution of the injected malicious code<\/a>.<\/p>\n<p><strong>Mitigation<\/strong><\/p>\n<p>To mitigate this vulnerability, users of affected versions of GoodLayers Hostel are strongly advised to apply the vendor patch as soon as it becomes available. In the interim, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can be employed as a temporary mitigation measure. These systems can <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2024-0582-a-potentially-dangerous-memory-leak-vulnerability-in-linux-kernel-s-io-uring-functionality\/\"  data-wpil-monitor-id=\"51985\">potentially detect and block attempts to exploit this vulnerability<\/a>, providing an additional layer of security while a permanent solution is attained.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview Cybersecurity threats are an ever-present concern in today&#8217;s digital landscape, and it is crucial to stay ahead of potential vulnerabilities that may compromise system security. In this context, one significant vulnerability, CVE-2025-39500, has been identified in GoodLayers Hostel, potentially impacting any system where this software is implemented. This vulnerability, due to Deserialization of Untrusted [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"footnotes":""},"categories":[1],"tags":[],"vendor":[],"product":[],"attack_vector":[],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-46114","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/46114","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/comments?post=46114"}],"version-history":[{"count":12,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/46114\/revisions"}],"predecessor-version":[{"id":51628,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/46114\/revisions\/51628"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=46114"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=46114"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=46114"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=46114"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=46114"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=46114"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=46114"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=46114"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=46114"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}